Welcome, Jason! Thanks for taking the time to join. A few answers for you:
No, the APK is only to install on your tablet. But you can click the “TeamDrawer” button to view and edit the shared notes. These are visible to anyone else in the world who also downloads the ToolBoox app.
Currently the TeamDrawer “Chit-chat” folder contains a note titled “Hello” that is also visible from your computer on the ToolBoox homepage 
The most useful feature for me (besides the TeamDrawer) is the Templates section. This can be used to export custom calendar templates for writing notes in the default Boox note-taking app.
The best way to get started with this to check out Gabor’s PDF template tutorial. After clicking “Export”, you’ll see the template under the “Local” tab in your notes:
New features are always being added of course! Are there any other features that you’d like to suggest?